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/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.facebook.presto.jdbc.internal.guava.collect;

import com.facebook.presto.jdbc.internal.guava.annotations.GwtCompatible;
import com.facebook.presto.jdbc.internal.guava.annotations.GwtIncompatible;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;

/**
 * Multiset implementation backed by a {@link HashMap}.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible(serializable = true, emulated = true)
public final class HashMultiset extends AbstractMapBasedMultiset {

  /** Creates a new, empty {@code HashMultiset} using the default initial capacity. */
  public static  HashMultiset create() {
    return new HashMultiset();
  }

  /**
   * Creates a new, empty {@code HashMultiset} with the specified expected number of distinct
   * elements.
   *
   * @param distinctElements the expected number of distinct elements
   * @throws IllegalArgumentException if {@code distinctElements} is negative
   */
  public static  HashMultiset create(int distinctElements) {
    return new HashMultiset(distinctElements);
  }

  /**
   * Creates a new {@code HashMultiset} containing the specified elements.
   *
   * 

This implementation is highly efficient when {@code elements} is itself a {@link Multiset}. * * @param elements the elements that the multiset should contain */ public static HashMultiset create(Iterable elements) { HashMultiset multiset = create(Multisets.inferDistinctElements(elements)); Iterables.addAll(multiset, elements); return multiset; } private HashMultiset() { super(new HashMap()); } private HashMultiset(int distinctElements) { super(Maps.newHashMapWithExpectedSize(distinctElements)); } /** * @serialData the number of distinct elements, the first element, its count, the second element, * its count, and so on */ @GwtIncompatible // java.io.ObjectOutputStream private void writeObject(ObjectOutputStream stream) throws IOException { stream.defaultWriteObject(); Serialization.writeMultiset(this, stream); } @GwtIncompatible // java.io.ObjectInputStream private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { stream.defaultReadObject(); int distinctElements = Serialization.readCount(stream); setBackingMap(Maps.newHashMap()); Serialization.populateMultiset(this, stream, distinctElements); } @GwtIncompatible // Not needed in emulated source. private static final long serialVersionUID = 0; }





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